Actually in AKOTAS Uther dies just before Arthur is of age to ascend to the throne, but before Arthur can get to know him, in the baseline and and space arcs. Start here and read for about a week's worth.
Usually Arthur is fostered less because Uther has died than because his birth is too soon to be quite proper and/or to keep the heir away from the dangers of court.
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Actually in AKOTAS Uther dies just before Arthur is of age to ascend to the throne, but before Arthur can get to know him, in the baseline and and space arcs. Start here and read for about a week's worth.
Usually Arthur is fostered less because Uther has died than because his birth is too soon to be quite proper and/or to keep the heir away from the dangers of court.